Add ¾ cup pecans to a food processor and process until smooth and buttery, stopping to scrape down as needed.
Meanwhile, combine ¼ cup erythritol with the melted butter in a small microwave-safe bowl and microwave for 1 minute. Add to pecans and process until smooth.
Add in protein powder and remaining 2 tablespoons of erythritol, and process until completely combined and crumbly. Because protein powders vary so much in texture and ability to hold liquid, add in almond milk one tablespoon at a time, processing thoroughly between each addition and stopping once there is enough liquid so that all the dry ingredients are incorporated. Add in coconut flour and almond extract process. Again, add almond milk in one tablespoon at a time and stop once the dough forms a ball. Add in remaining ¼ cup chopped pecans, pulsing to combine.
Press the dough into the prepared loaf pan. Cut into 32 pieces (using a pizza cutter for clean cuts) and devour.